pickering



P. PICKERING.

CONCRETE CONDUIT.

APPLICATION FILED NOV. 6. 1915.

Patented Aug. 15,1916.

2 SHEETS-SHEET I.

inventor P Pe'ckerc'rzy P. PlCKERlNG.

CONCRETE CONDU-IT.

APPLICATION FILED NOV. 6, 1915.

1 1 95,08 1 Patented Aug. 15, 1916.

2 SHEETS-SHEET 2.

PERCY PICKERING, OF BRADFORD, ENGLAND.

CONCRETE GONDUI'I.

nun-

Specification of Letters Patent.

Patented An". 15, 1916.

Application filed November 6, 1915. Serial No. 60,060.

To all whom it may concern:

Be it known that I, Pnnor PIGKERING, a subject of His Majesty the King of England, residing at Bradford, in the county of York, Kingdom of England, have invented a certain new and useful Improvement in Concrete Conduits, of which the following is a specification.

Myinvention relates to the jointing to:-

gether end to end of concrete roof gutters and concrete tubes manufactured in standard lengths and comprises the securing at each extremity of a system of longitudinal reinforcing rods which pass through the center of the concrete forming the gutter or tube, of a metal jointing plate provided with a tongue on the inside face forming a watertight joint with the concrete, the edges of the plate having dovetailed indentations providing a key for the concrete, and the outer or jointing face being sunk for the jointing material, and provided with projecting lugs holed for bolts and arranged to come directly in line with the ends of the reinforcing rods connecting the two jointing plates, for the purpose of drawing the joint- In the accompanying drawings with reference to which the present invention is hereinafter described :Figure 1 is an elevation of the end of a gutter constructed according to my invention; Fig. 2 is a cross section along line A. A. of Fig. 1; Fig. 3 is a cross section along line B. B. of Fig. 1; Fig. 4 shows the outer elevation of the end of the gutter; and Fig. 5 is the elevation of the end of a concrete tube constructed according to my invention.

As shown I employ a metal casting (1) which is secured to each extremity of the longitudinal reinforcing rods by means of passing the rods through holes formed in the casting (1) and fastened on the outside by screw nuts (3) recessed flush with face of the casting as shown in Fig. 2. On the inner face of the casting (1) where the concrete (7) joins the metal, I employ a projecting ledge or tongue (4;) for the purpose of proper adhesion to the concrete and also to obtain a watertight joint. On the edges of the casting (1) dovetailed indentations as shown are formed to provide a key for the ing faces of two lengths together.

Copies of this patent may be obtained for concrete, metal casting and finishing flush with the end, thus preventing the corrosion of the metal forming the joint. On the jointing face of the casting (1) a sinking (5) is formed in the metal to allow sufficient space for the jointing material which latter may be either mastic or red lead and hemp. The reinforcing rods (2) are supported at intervals in the length by transverse wiring, the intervals varying according to the size, section and strength required of the gutter or tube. The castings (1) have lugs (6) projecting beyond the face of the concrete (7), holed for bolts to draw the two jointing faces together. The reinforcing rods (2) with the castings (1) attached, after being wired transversely as described are placed in position inside the form or machine and the concrete cast around the same to the section required.

WVhat I claim as new and desire to secure by Letters Patent of the United States is 1. A concrete conduit comprising end plates open at their upper ends and provided with inwardly projecting perforated lugs and lower outwardly projecting lugs, rods extending through perforations in the end plates to tie same together, the outer face of each plate having a depression, the

' inner and outer edges of the plates having notches, and concrete extending from the outer face of one plate to the outer face of the opposite plate, the concrete engaging in the notches and embracing the rods forming an anchor to hold the structure together.

2. A concrete conduit comprising end plates open at their upper ends and provided with inwardly and outwardly proj e'cting perforated lugs, each end plate having an inwardly projecting flange extending around its inner face, the inner and outer edges of the end plates having notches, rods connecting the adjacent end plates, and a concrete body extending from one plate to the other and anchored in the notches and on the flanges and inclosing the rods, the outer ends of the concrete being flush with the outer faces of the plates.

In testimony whereof I have hereunto signed my name to this specification.

PERCY PIOKERING.

Washington, I). C.

the latter covering the edges of the 

